Polar Windows

After only 2 1/2 years after installation the top hinge of our exterior door loosened. It was evident by just looking at the gap between the hinge and the frame. The door was out of alignment and would not even close without being forced. Without even inspecting it, Polar said it was due to house shifting. I consulted an independent structural engineer. They said there was no evidence of house shifting. The outside frame was still completely square and there was no evidence of cracks in the house. Polar came and tightened the screws. Took 10 minutes. Charged me $125. This is for a door with a life time guarantee??? Not satisfied.